14 CFR 1.3 - Rules of construction.

(a) In Subchapters A through K of this chapter, unless the context requires otherwise:

(1) Words importing the singular include the plural;

(2) Words importing the plural include the singular; and

(3) Words importing the masculine gender include the feminine.

(b) In Subchapters A through K of this chapter, the word:

(1)Shall is used in an imperative sense;

(2)May is used in a permissive sense to state authority or permission to do the act prescribed, and the words “no person may * * *” or “a person may not * * *” mean that no person is required, authorized, or permitted to do the act prescribed; and

This rulemaking would replace Special Federal Aviation Regulation No. 106 with acceptance criteria for portable oxygen concentrators to be used by passengers in air carrier operations, commercial operations and certain other operations using large aircraft. Currently, the agency assesses each portable oxygen concentrator on a case-by-case basis to determine whether it is safe for use on board aircraft. If the agency determines that a portable oxygen concentrator is safe for use on board aircraft, the specific model is identified in regulations. This rulemaking would replace the burdensome approval process with acceptance criteria and a requirement for manufacturers to demonstrate compliance by affixing a label on the exterior of the portable oxygen concentrator applied in a manner that ensures it will remain affixed for the life of the device. The proposed acceptance criteria and labeling requirement would only affect portable oxygen concentrators intended for use on board aircraft. Portable oxygen concentrators currently approved for use on board aircraft would not be affected by this proposal and will be listed in this rule as approved. This rulemaking would also eliminate redundant requirements and paperwork requirements that are not necessary for aviation safety thereby reducing burdens for portable oxygen concentrator manufacturers, passengers who use portable oxygen concentrators while traveling, and aircraft operators conducting air carrier operations, commercial operations or certain operations using large aircraft.